NicoleMaestri

Shares of Ariba slid 14 percent after the company said revenue will ring in at only half of what analysts had been expecting. The software company also said it's canceling its merger with Agile Software
AGIL, +0.00%
which sent those share down 12 percent in trading on the Island ECN. See video brief.

The warnings came the same day that I2 Technologies
ITWO
said preliminary results were below expectations and the enterprise software company announced job cuts. But I2 shares rose in Nasdaq trading as its warning wasn't as severe as expected. Read about I2's warning.

In a note Monday, Pacific Growth Equities analyst John Ederer told clients to expect more warnings from the enterprise software sector.

Inktomi

Software company Inktomi
INKT
is cutting 25 percent of its workforce as financial results continue to suffer.

Shares fumbled in evening trading, down 27 percent to $4.55.

Inktomi warned investors about its second quarter, saying it now expects a loss of 23 cents to 25 cents a share on revenue of $36 million to $38 million. Analysts surveyed by First Call/Thomson Financial were expecting a loss of 4 cents a share.

"Economic conditions in the United States and Europe have declined more quickly than we had initially anticipated, forcing us to take strong cost-cutting measures for the continued health of our business," said David Peterschmidt, president and CEO. Read full story.

Shares closed down 43 cents, or 6.5 percent, at $6.22.

Redback Networks

Redback Networks warned that it expects lower first-quarter revenue along with restructuring and other one-time charges totaling $53 million in the first half as the company moves to cut 150 workers, or 12 percent of its staff.

The provider of networking and fiber-optic technologies said revenue for the first quarter would total $85 million to $90 million. Redback
RBAK
added it would record a first-quarter restructuring-related charge of $27 million over the next two quarters.

A charge of $24 million stemming from excess inventory is expected in the period as well, Redback said.

Shares added to their regular-session loss, trading down 13 percent to $10.15 on Island. Shares closed down nearly 11 percent to $11.70 on the Nasdaq.

E.piphany

San Mateo, Calif.-based E.piphany
EPNY
warned that its revenue for the first quarter will be $38 million with a net loss as much as 40 cents per share.

On Island, shares slid nearly 19 percent to $7.94 after the news.

"The shortfall is primarily due to longer sales cycles caused by the continuing economic uncertainty in North American markets," said Roger Siboni, president and CEO, in a statement.

Analysts, on average, had been expecting a loss of 9 cents per share.

Shares of the e-commerce software firm closed down nearly 17 percent to $9.75 before the news.

Entrust

Entrust
ENTU
said that it is lowering its first-quarter earnings estimate due to the weakening economy and slowed sales.

The maker of security software now expects to lose between 32 and 34 cents a share, whereas it was expecting a gain between 1 and 2 cents a share. Analysts were also expecting a gain of 2 cents a share. Revenue is now expected to fall between $31 million and $32 million, lower than the previous estimate of $50 million to $51 million.

Shares of the Plano, Texas-based company closed off $1.03, or 12 percent, at $7.28 ahead of the news. On Island, shares slid 28 percent to $5.25.

Documentum

Documentum
DCTM
said it will have preliminary first-quarter revenue of $43 million to $46 million, with license revenue of $19 million to $21 million, resulting in a net loss.

Analysts surveyed by First Call/Thomson Financial expected earnings of 7 cents a share, on average. Analysts also expected revenue of $58.3 million, according to First Call.

According to a company statement, the Pleasanton, Calif.-based company experienced order delays and cancellations toward the end of March on deals that had been expected to close prior to March 31.

"We are uncertain of the extent or duration of the impact that the economic slowdown may have on our business," said Chairman and CEO Jeffrey A. Miller. Documentum shares closed down $1.47, or 13 percent, at $9.53.

On Island, shares traded down $2.53, or 27 percent, to $7.

Harmonic

Harmonic
HLIT, -0.20%
said it expects first-quarter losses of 45 cents to 55 cents a share on revenue of $39 million to $41 million. Analysts surveyed by First Call/Thomson Financial expected a loss of 29 cents a share.

Actual results for the fiber-optic transmission equipment maker will be reported on April 25.

"Our business continues to be adversely affected by a weak capital spending environment at many of our major customers," said Anthony J. Ley, chairman, president and CEO. "As a result, we continue to face order cancellations and delays, mainly in our [Broadband Access Networks] division.

Harmonic also restated year 2000 results to include a pre-tax charge for inventory provisions of $10 million.

Shares closed down 22 percent to $4.38 and slid 14 percent to $3.75 on Island.

National Instruments

National Instruments
NATI, +1.51%
said it expects first-quarter revenue of about $108 million, falling short of the current consensus estimate of $112 million.

The instrumentation hardware and graphical software company attributed the shortfall in revenue to the overall slowdown in the economy.

On Island, shares slid nearly 4 percent to $30.44.

Excluding a foreign exchange loss, earnings will be in the range of 27 cents to 29 cents a share. Including the foreign exchange loss, earnings will be in the range of 25 cents to 27 cents a share.

Analysts currently expect a profit of 29 cents a share. Full-year earnings will be in the range of $1.06 to $1.22, while analysts had been expecting a profit of $1.28.

Intraday Data provided by SIX Financial Information and subject to terms of use. Historical and current end-of-day data provided by SIX Financial Information. All quotes are in local exchange time. Real-time last sale data for U.S. stock quotes reflect trades reported through Nasdaq only. Intraday data delayed at least 15 minutes or per exchange requirements.